Hi,
I have a pair of 2 way bookshelf speakers and one of the tweeters was physically damaged by my friends kids.
I opened it up the speaker adn teh tweeter is a vifa D20TD-05-06 3/4 soft dome. I think it is available but i would not mind upgrading the tweets in both speakers.
I am open to suggestions but want to stay below say $45 dollars each tweeter.
D20TD-05-06 specs
Voice coil resistance [ohm] 4.2
Sensitivity [dB] 89
6 ohms *DC resistance: 4.2 ohms *Fs: 750 Hz *SPL: 89 dB 1W/1m Free air resonance [Hz] 1700
I was already planning on building new cabinets for these speakers so it does not have to match in size.
According to the manufacturer my speakers are crossed over at 2500Hz
i was looking at PE site and there are some 1 inch soft domes i thought i could try.
like VIFA PL27TG-35-06
6 ohms *DC resistance: 4.6 ohms *Frequency range: 1,500-25,000 Hz *Fs: 750 Hz *SPL: 91 dB 1W/1m
Could i just pad this down a bit to because of its greater sensitivity? Or does its higher DC resistance cause more problems.
the tweeter section of the crossover seems simple with a 3.9uF cap in series and an inductor parallel. not sure of the inductor value i will try to get them measured.
good ideas or suggestions apreciated.
I have a pair of 2 way bookshelf speakers and one of the tweeters was physically damaged by my friends kids.
I opened it up the speaker adn teh tweeter is a vifa D20TD-05-06 3/4 soft dome. I think it is available but i would not mind upgrading the tweets in both speakers.
I am open to suggestions but want to stay below say $45 dollars each tweeter.
D20TD-05-06 specs
Voice coil resistance [ohm] 4.2
Sensitivity [dB] 89
6 ohms *DC resistance: 4.2 ohms *Fs: 750 Hz *SPL: 89 dB 1W/1m Free air resonance [Hz] 1700
I was already planning on building new cabinets for these speakers so it does not have to match in size.
According to the manufacturer my speakers are crossed over at 2500Hz
i was looking at PE site and there are some 1 inch soft domes i thought i could try.
like VIFA PL27TG-35-06
6 ohms *DC resistance: 4.6 ohms *Frequency range: 1,500-25,000 Hz *Fs: 750 Hz *SPL: 91 dB 1W/1m
Could i just pad this down a bit to because of its greater sensitivity? Or does its higher DC resistance cause more problems.
the tweeter section of the crossover seems simple with a 3.9uF cap in series and an inductor parallel. not sure of the inductor value i will try to get them measured.
good ideas or suggestions apreciated.
ok well i might just try it without advice.
I am a better wood woker than audio circuit designer and i will be gluing up some cabinets i cut yesterday. I just need to decide if i will change tweeter or not so i can route the speaker recesses and holes
If i change tweeters i understand that some crossover adjustments may be needed. So i am looking for close match in dc resistance, sensitivity (but i understand how to l-pad so not critical).
what im not sure about is Fs? how will this effect choice for a tweeter?
I also will try to find a similar impeadance curve. I am assuming that the Impeadance should match well around the crosover frequency and beyond that not make much difference. Am i correct??
I am a better wood woker than audio circuit designer and i will be gluing up some cabinets i cut yesterday. I just need to decide if i will change tweeter or not so i can route the speaker recesses and holes
If i change tweeters i understand that some crossover adjustments may be needed. So i am looking for close match in dc resistance, sensitivity (but i understand how to l-pad so not critical).
what im not sure about is Fs? how will this effect choice for a tweeter?
I also will try to find a similar impeadance curve. I am assuming that the Impeadance should match well around the crosover frequency and beyond that not make much difference. Am i correct??
personally I would be trying to find a tweeter that is as close to the original in sensitivity, FR, and impedance as possible. Vifa still makes D19/20 series tweeters as far as I know, so you should be able to find a drop in or close to replacement. If you try to upgrade without any measurement/design capability, you could as easily degrade the sound as improve it IMHO.
Vifa still make the D20..
It is very nice tweeter, much better (IMO) than the D19.
Stick to the D20, any "upgrade" will require totally reorganising the x-o.
It is very nice tweeter, much better (IMO) than the D19.
Stick to the D20, any "upgrade" will require totally reorganising the x-o.
thanks for your thoughts
i just might by the direct replacement.
I dont mind playing aroung with the crossovers though because a couple of years ago i totally rebuilt the xovers. I just copied the originals with quality components but split out the tweets and woofers to biwire.. (I had te electronics shop where i used to work measure the coils). I have many resistors from trying differnt pads on my car tweeters.
As far as messing up the original sound am i correct as follows?
Lets say my xover is 2500hz and the original and replacement tweeter both have flat response and similar impeadance in the region then it would be a pretty good match.
but voice coil resistance is higher on the replacement. this will shift the xover to higer frequency right?
what im sure i dont know is how Fs effects things if it does?
ehh if i screw it up ill just put the old ones back together give them to my brother and start a project aroung the new tweeters
i just might by the direct replacement.
I dont mind playing aroung with the crossovers though because a couple of years ago i totally rebuilt the xovers. I just copied the originals with quality components but split out the tweets and woofers to biwire.. (I had te electronics shop where i used to work measure the coils). I have many resistors from trying differnt pads on my car tweeters.
As far as messing up the original sound am i correct as follows?
Lets say my xover is 2500hz and the original and replacement tweeter both have flat response and similar impeadance in the region then it would be a pretty good match.
but voice coil resistance is higher on the replacement. this will shift the xover to higer frequency right?
what im sure i dont know is how Fs effects things if it does?
ehh if i screw it up ill just put the old ones back together give them to my brother and start a project aroung the new tweeters
What size mid??
if 4" or less, maybe the OW1 (or whatever the 19mm Hyq is called) would be a possible improvement.. although I have not used it myself, it does get raves form lots of fellow DIYers. Other than that , I'm not sure what else is available that might be considered an upgrade from a D20.
you could go to a 25mm tweet, of which there are several pretty good ones at reasonable prices
if 4" or less, maybe the OW1 (or whatever the 19mm Hyq is called) would be a possible improvement.. although I have not used it myself, it does get raves form lots of fellow DIYers. Other than that , I'm not sure what else is available that might be considered an upgrade from a D20.
you could go to a 25mm tweet, of which there are several pretty good ones at reasonable prices
i was thinking going to a 25mm, the woofer it will mate with is a 6.5" cant tell what make/model
i think i may buy much nicer tweeters play around with them a bit for now and use them in a future established design or kit.
maybe scanspeak d2905/9500 lots of prjects done with these
or Usher 9950C-15 tweeter
there is a 3way (Exodus Audio 641)wth this amd extremis woofer that looks good to me
http://diycable.com/main/default.php
but for use now these are 8ohm not six like my d20
i think i may buy much nicer tweeters play around with them a bit for now and use them in a future established design or kit.
maybe scanspeak d2905/9500 lots of prjects done with these
or Usher 9950C-15 tweeter
there is a 3way (Exodus Audio 641)wth this amd extremis woofer that looks good to me
http://diycable.com/main/default.php
but for use now these are 8ohm not six like my d20
- Status
- Not open for further replies.